Standards & Tools

Purpose: Accurate gestational-age estimation in early pregnancy
Age range: 8 weeks until 14 weeks gestational age

Purpose: Assess early pregnancy fetal size (crown-rump length)
Age range: 8 weeks until 14 weeks gestational age

Purpose: Assess symphysis-fundal height 
Age range: 16 weeks until 40 weeks gestational age

Purpose: Assess fetal anthropometric growth measurements
Age range: 14 weeks until 40 weeks gestational age

Purpose: Provide gestational age-specific normative centiles for umbilical artery Doppler indices
Age range: 24 weeks until 40 weeks gestational age

Purpose: Assess maternal weight gain during pregnancy
Age range: 15 weeks until 40 weeks gestational age

Purpose: Assess size at birth (within 24 hours) for very preterm newborns
Age range: At birth, born between gestational weeks 24 and 32+6

Purpose: Assess size at birth (within 24 hours) for newborns
Age range: At birth, born between gestational weeks 33 and 42+6

Purpose: Neurodevelopment assessment
Age range: 22 to 30 months

Purpose: Assess the postnatal growth of preterm infants (born between gestational weeks 27 and 37)
Age range: From preterm birth (27+0 to 36+6) until 64 weeks postmenstrual age